Abstract
1. Prolonged grinding of carbonyl iron powders results in a decrease of the magnetic permeability of carbonyl cores made by both the double and single insulation methods. 2. In the manufacture of cores by the single insulation method, prolonged grinding is essential for breaking up conglomerates and securing a high relative quality. Too short a grinding time gives rise to a sharp decrease of this factor. In the case of cores made by the double insulation method, prolonged grinding exerts no marked influence on the relative quality. 3. In connection with the introduction of double insulation of carbonyl iron powders in the electronics industry, it will be necessary to review and amend the existing specifications for the duration of grinding of powders with the object of increasing their permeability and reducing their cost.
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